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(No'moael.)

J. R. SC OTT.

Sewing MachineIl No. 233,561. Patented oct.19,1sso.

INVBNTOR M20/.Q BY

N.PETERS, PMDTWLIYHOGRAPNER. WASHINGTON. D C

UNITED STATES YEEToE PATENT JACOB R. SCOTT, OF NYAOK, NEW YORK, ASSIGNOR TO ANDREW H. JAOKMAN, OF SAME PLACE.

HIMSELF AND SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 233,561, dated October 19, 1880. Application led April 3, 1880. (No model.)

To alt .whom it may concern Be it known that I, JACOB R. SCOTT, of Nyack, in the county of Rockland and State of New York, have invented new and useful Improvements in Sewing-Machines, of which the following is a specification.

My improvements relate to machines for sewing boots and shoes of the class wherein a rocking looper is fitted in the horn.

The object of the invention is to provide means whereby the looper shall always be held in the proper position relative to the needle while the horn turns.

My invention consistsin providing the shafts through which the tubular socket-piece which carries the rocking looper is revolved with an elastic step, to prevent the socket-piece from being dislocated by expansion and contraction.

It also consists in a looper formed with a slot for guiding the needle.

These features will be described in detail with reference to the accompanying drawings, forming part of this specification, wherein- Figure 1 is a sectional side elevation of the horn as fitted with my improvements. Fig. 2 is a top view of the horn-tip. Fig. 3 is a side view of the supporting-yoke for the gearing. Figs. 4 and 5 are detail views of the rocking looper.

Similar letters of reference indicate corresponding parts.

A is the horn, fitted to turn on the stud a of the supporting-bed. (Not shown.) b is the tubular socket-piece iitted in a recess at the tip of horn A and held down to place by a cap-piece, c, that is attached to the horn by screws, the cap c being aperturcd for the passage of the needle.

d is the looper, which is of semi-spherical forin, and held in the socket b by a cross-pin, so that it may rock in a vertical plane. This looper d is formed with a groove, d', in its upper surface in the direction of the feed, and is provided with a hole for the thread to pass.

Upon the stud a, which the horn turns on, is a fixed gear-wheel, e, and fitted on a short shaft, f, that is sustained in a vertical position on the base of the horn A, is a pinion, g, meshing with wheel e, so that as the horn is turned the pinion g and shaftf are revolved.

Upon the base of the horn is itted a shaft, h, having at one end a bevel-pinion, i, meshing with a similar pinion on shaft f, and at the other end a bevel-pinion, 7c, that engages with a bevel-pinion on a shaft, Z, that is sustained in the horn proper and extends to the tip.

The upper end of shaft Z is formed with cogs or fitted with a bevel-pinion, that meshes with teeth formed on the surface of the socketpiece b.

The pinion g has one-half the number of the teeth of the fixed gear c, the socket-piece b twice the number of teeth of the pinion on shaft l, and the other gears are equal.

By this mechanism the socket bis always held in the same position with reference to the needle, however the horn may be turned, as the gearing is proportioned to obtain that effeet.

As it is usual to heat the tip of the horn, there is consequently a certain amount of eX- pansion and contraction, which, if not provided for, might dislocate the socket b. This I provide for at the lower end of shaft t by the step 0, which supports the shafts h l and a yoke, p, Figs. 1 and 4, in which the stepois hung, and which yokep extends in line with shaft Z, and is supported upon a spring, g, in a tube, q', that is fitted in the base of the horn. The spring is sustained by a screw-plug, r, which allows adjustment of tension, and by these means the shafts h lare held up to place,

and the step 0 may give way to expansion or end movement of the shaft l.

Having thus described my invention, Iclaim as new and desire to secure by Letters Patent- 1. In combination with the shafts h Z,the step o, yoke p, spring q, and tube q', substantially as and for the purposes set forth.

2. The rocking looper d, of semi-spherical form, and provided with the groove d', combined with the stationary socket-piece b and revolving horn A, as and for the purposes set forth.

JACOBR. SCOTT.

Witnesses:

GEO. D. WALKER, C. SEDGWIGK. 

